Of the early characters whose names are closely linked with the history of the Yellowstone, the most distinguished is James Bridger, a sketch of whose life is given in Appendix A, under "Bridger Lake." That he had often been in the region of the Yellowstone Park, and was familiar with its unique features, is now well known. His first personal knowledge of them is believed to date from 1824, when he is supposed to have been upon the upper Yellowstone. It is certain that before 1840 he knew of the existence of the geysers in the Firehole Valley, although at that time he had probably not seen them himself. Between 1841 and 1844 Bridger was leader of a grand hunting and trapping expedition, which for upward of two years, wandered over the country from the Great Falls of the Missouri to Chihuahua, Mexico. At some time during this expedition he entered the region of the upper Yellowstone and saw most of its wonders. His descriptions of the geysers and other remarkable features of that locality can be traced back nearly to this period and present an accuracy of detail which could come only from personal observation. Among the records of these descriptions the earliest is that by Captain J. W. Gunnison, of the Corps of Topographical Engineers, who was associated with Captain Howard Stansbury, of the same corps, in the Salt Lake Expedition of 1849-50. The record is found in Gunnison's History of the Mormons,[S] and dates back to this expedition. It reads: "He [Bridger] gives a picture, most romantic and enticing, of the head waters of the Yellow Stone. A lake, sixty miles long, cold and pellucid, lies embosomed among high precipitous mountains. On the west side is a sloping plain, several miles wide, with clumps of trees and groves of pine. The ground resounds with the tread of horses. Geysers spout up seventy feet high, with a terrific, hissing noise, at regular intervals. Water-falls are sparkling, leaping and thundering down the precipices, and collect in the pool below. The river issues from this lake, and for fifteen miles roars through the perpendicular cañon at the outlet. In this section are the 'Great Springs,' so hot that meat is readily cooked in them, and as they descend on the successive terraces, afford at length delightful baths. On the other side is an acid spring, which gushes out in a river torrent; and below is a cave, which supplies 'vermillion' for the savages in abundance." [S] Page 151, Gunnison's History of the Mormons. See Appendix E. In this admirable summary we readily discover the Yellowstone Lake, the Grand Cañon, the Falls, the geyser basins, the Mammoth Hot Springs, and Cinnabar Mountain. Prior to 1860, Bridger had related these accounts to Captain Warren, Captain Raynolds, Doctor Hayden, and others, and although he seems to have convinced these gentlemen that there was something in his stories, they still attributed less to fact than to fancy.